Abstract

Protection from the nematocysts of sea anemones is acquired by anemone fishes by acclimation; initially, anemone fishes are stung but after acclimation are protected. It has been found that an unacclimated anemone fish is stung by sea anemones either with or without acclimated fish, while an acclimated fish is stung by neither. If the surface of a partially or fully acclimated anemone fish is wiped off, the fish immediately loses its protection and is again stung. Pieces of Amphiprion skin as well as dead Amphiprion with the surface mucous coat undisturbed are protected from their anemones. These data show that an acclimated anemone fish is protected from sea anemones due to something associated with its epidermal mucous coat and that this protection is acquired during acclimation.

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